java int array add element

how to append values in integer array in java

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
 
class Main
{
    private static Integer[] append(Integer[] arr, int element) {
        List<Integer> list = new ArrayList<>(Arrays.asList(arr));
        list.add(element);
 
        return list.toArray(new Integer[0]);
    }
 
    public static void main(String[] args) {
 
        Integer[] nums = { 1, 2, 3, 4 };
 
        nums = append(nums, 5);     // add 5 to nums[]
        System.out.println(Arrays.toString(nums));
    }
}

Posted by: Guest on March-04-2021

Source

// A better solution would be to use an ArrayList which can grow as you need it. // The method ArrayList.toArray( T[] a ) // gives you back your array if you need it in this form. List<String> where = new ArrayList<String>(); where.add(element); where.add(element); // If you need to convert it to a simple array... String[] simpleArray = new String[ where.size() ]; where.toArray( simpleArray );

//original array String[] rgb = new String[] {"red", "green"}; //new array with one more length String[] rgb2 = new String[rgb.length + 1]; //copy the old in the new array System.arraycopy(rgb, 0, rgb2, 0, rgb.length); //add element to new array rgb2[rgb.length] = "blue"; //optional: set old array to new array rgb = rgb2;

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